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I have a few Ubuntu instances on EC2 where I use the /mnt instance storage to keep logs and other fungible stuff. In order to store user logs the /mnt directory needs to have 777 permissions:
$ sudo chmod 777 /mnt
But periodically (about daily) permissions revert back to 755, for no apparent reason. Is there any way to make /mnt have write permissions for all users -- and keep it that way? I already have a task that runs on startup with the above line, but apparently it does not work.
A periodic task would be a last resort; honestly, I would like to understand the problem and solve it correctly. I have searched here and on the intertubes, no luck so far -- it is not an easily googleable question anyway.
Perhaps some mount options would do the trick? My fstab:
/dev/xvdb /mnt auto defaults,nobootwait,comment=cloudconfig 0 2
alexfernandez
Posted 2013-09-13T22:27:52.030
Reputation: 103
What filesystem is on the volume being mounted? You should almost never have permissions set to 0777. That strongly indicates you are doing something wrong. – Zoredache – 2013-09-13T22:55:47.310
1Can you just create a sub-directory to /mnt that will have the permissions you need? – ernie – 2013-09-13T23:01:37.800
@Zoredache Possibly, in that case I would like to know how to do things right. – alexfernandez – 2013-09-14T07:41:25.347
@ernie I suppose so, but I would need to recreate that directory on boot using a task. I am already setting permissions to 777 in a task and it is not working. I would like to know what is wrong so that I can be sure that any new scheme works without mucking around. – alexfernandez – 2013-09-14T07:44:43.297
I'm not sure what's resetting the mount points permissions (I'd guess something with how ephemeral storage works on EC2), but I'd guess that it won't change permissions on subdirectories . . . – ernie – 2013-09-15T17:06:28.483
@ernie I suppose that it will have to do. If you send an answer I will accept it then. – alexfernandez – 2013-09-16T07:32:43.857